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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 *
7 */
8
9#ifndef _SELINUX_SECURITY_H_
10#define _SELINUX_SECURITY_H_
11
12#include <linux/compiler.h>
13#include <linux/dcache.h>
14#include <linux/magic.h>
15#include <linux/types.h>
16#include <linux/refcount.h>
17#include <linux/workqueue.h>
18#include "flask.h"
19
20#define SECSID_NULL 0x00000000 /* unspecified SID */
21#define SECSID_WILD 0xffffffff /* wildcard SID */
22#define SECCLASS_NULL 0x0000 /* no class */
23
24/* Identify specific policy version changes */
25#define POLICYDB_VERSION_BASE 15
26#define POLICYDB_VERSION_BOOL 16
27#define POLICYDB_VERSION_IPV6 17
28#define POLICYDB_VERSION_NLCLASS 18
29#define POLICYDB_VERSION_VALIDATETRANS 19
30#define POLICYDB_VERSION_MLS 19
31#define POLICYDB_VERSION_AVTAB 20
32#define POLICYDB_VERSION_RANGETRANS 21
33#define POLICYDB_VERSION_POLCAP 22
34#define POLICYDB_VERSION_PERMISSIVE 23
35#define POLICYDB_VERSION_BOUNDARY 24
36#define POLICYDB_VERSION_FILENAME_TRANS 25
37#define POLICYDB_VERSION_ROLETRANS 26
38#define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
39#define POLICYDB_VERSION_DEFAULT_TYPE 28
40#define POLICYDB_VERSION_CONSTRAINT_NAMES 29
41#define POLICYDB_VERSION_XPERMS_IOCTL 30
42#define POLICYDB_VERSION_INFINIBAND 31
43#define POLICYDB_VERSION_GLBLUB 32
44#define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
45
46/* Range of policy versions we understand*/
47#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
48#define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
49
50/* Mask for just the mount related flags */
51#define SE_MNTMASK 0x0f
52/* Super block security struct flags for mount options */
53/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
54#define CONTEXT_MNT 0x01
55#define FSCONTEXT_MNT 0x02
56#define ROOTCONTEXT_MNT 0x04
57#define DEFCONTEXT_MNT 0x08
58#define SBLABEL_MNT 0x10
59/* Non-mount related flags */
60#define SE_SBINITIALIZED 0x0100
61#define SE_SBPROC 0x0200
62#define SE_SBGENFS 0x0400
63#define SE_SBGENFS_XATTR 0x0800
64
65#define CONTEXT_STR "context"
66#define FSCONTEXT_STR "fscontext"
67#define ROOTCONTEXT_STR "rootcontext"
68#define DEFCONTEXT_STR "defcontext"
69#define SECLABEL_STR "seclabel"
70
71struct netlbl_lsm_secattr;
72
73extern int selinux_enabled_boot;
74
75/* Policy capabilities */
76enum {
77 POLICYDB_CAPABILITY_NETPEER,
78 POLICYDB_CAPABILITY_OPENPERM,
79 POLICYDB_CAPABILITY_EXTSOCKCLASS,
80 POLICYDB_CAPABILITY_ALWAYSNETWORK,
81 POLICYDB_CAPABILITY_CGROUPSECLABEL,
82 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
83 POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS,
84 __POLICYDB_CAPABILITY_MAX
85};
86#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
87
88extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
89
90/*
91 * type_datum properties
92 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
93 */
94#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
95#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
96
97/* limitation of boundary depth */
98#define POLICYDB_BOUNDS_MAXDEPTH 4
99
100struct selinux_avc;
101struct selinux_ss;
102
103struct selinux_state {
104#ifdef CONFIG_SECURITY_SELINUX_DISABLE
105 bool disabled;
106#endif
107#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
108 bool enforcing;
109#endif
110 bool checkreqprot;
111 bool initialized;
112 bool policycap[__POLICYDB_CAPABILITY_MAX];
113
114 struct page *status_page;
115 struct mutex status_lock;
116
117 struct selinux_avc *avc;
118 struct selinux_ss *ss;
119} __randomize_layout;
120
121void selinux_ss_init(struct selinux_ss **ss);
122void selinux_avc_init(struct selinux_avc **avc);
123
124extern struct selinux_state selinux_state;
125
126static inline bool selinux_initialized(const struct selinux_state *state)
127{
128 /* do a synchronized load to avoid race conditions */
129 return smp_load_acquire(&state->initialized);
130}
131
132static inline void selinux_mark_initialized(struct selinux_state *state)
133{
134 /* do a synchronized write to avoid race conditions */
135 smp_store_release(&state->initialized, true);
136}
137
138#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
139static inline bool enforcing_enabled(struct selinux_state *state)
140{
141 return READ_ONCE(state->enforcing);
142}
143
144static inline void enforcing_set(struct selinux_state *state, bool value)
145{
146 WRITE_ONCE(state->enforcing, value);
147}
148#else
149static inline bool enforcing_enabled(struct selinux_state *state)
150{
151 return true;
152}
153
154static inline void enforcing_set(struct selinux_state *state, bool value)
155{
156}
157#endif
158
159#ifdef CONFIG_SECURITY_SELINUX_DISABLE
160static inline bool selinux_disabled(struct selinux_state *state)
161{
162 return READ_ONCE(state->disabled);
163}
164
165static inline void selinux_mark_disabled(struct selinux_state *state)
166{
167 WRITE_ONCE(state->disabled, true);
168}
169#else
170static inline bool selinux_disabled(struct selinux_state *state)
171{
172 return false;
173}
174#endif
175
176static inline bool selinux_policycap_netpeer(void)
177{
178 struct selinux_state *state = &selinux_state;
179
180 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
181}
182
183static inline bool selinux_policycap_openperm(void)
184{
185 struct selinux_state *state = &selinux_state;
186
187 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
188}
189
190static inline bool selinux_policycap_extsockclass(void)
191{
192 struct selinux_state *state = &selinux_state;
193
194 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
195}
196
197static inline bool selinux_policycap_alwaysnetwork(void)
198{
199 struct selinux_state *state = &selinux_state;
200
201 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
202}
203
204static inline bool selinux_policycap_cgroupseclabel(void)
205{
206 struct selinux_state *state = &selinux_state;
207
208 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
209}
210
211static inline bool selinux_policycap_nnp_nosuid_transition(void)
212{
213 struct selinux_state *state = &selinux_state;
214
215 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
216}
217
218static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
219{
220 struct selinux_state *state = &selinux_state;
221
222 return state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS];
223}
224
225int security_mls_enabled(struct selinux_state *state);
226int security_load_policy(struct selinux_state *state,
227 void *data, size_t len);
228int security_read_policy(struct selinux_state *state,
229 void **data, size_t *len);
230size_t security_policydb_len(struct selinux_state *state);
231
232int security_policycap_supported(struct selinux_state *state,
233 unsigned int req_cap);
234
235#define SEL_VEC_MAX 32
236struct av_decision {
237 u32 allowed;
238 u32 auditallow;
239 u32 auditdeny;
240 u32 seqno;
241 u32 flags;
242};
243
244#define XPERMS_ALLOWED 1
245#define XPERMS_AUDITALLOW 2
246#define XPERMS_DONTAUDIT 4
247
248#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
249#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
250struct extended_perms_data {
251 u32 p[8];
252};
253
254struct extended_perms_decision {
255 u8 used;
256 u8 driver;
257 struct extended_perms_data *allowed;
258 struct extended_perms_data *auditallow;
259 struct extended_perms_data *dontaudit;
260};
261
262struct extended_perms {
263 u16 len; /* length associated decision chain */
264 struct extended_perms_data drivers; /* flag drivers that are used */
265};
266
267/* definitions of av_decision.flags */
268#define AVD_FLAGS_PERMISSIVE 0x0001
269
270void security_compute_av(struct selinux_state *state,
271 u32 ssid, u32 tsid,
272 u16 tclass, struct av_decision *avd,
273 struct extended_perms *xperms);
274
275void security_compute_xperms_decision(struct selinux_state *state,
276 u32 ssid, u32 tsid, u16 tclass,
277 u8 driver,
278 struct extended_perms_decision *xpermd);
279
280void security_compute_av_user(struct selinux_state *state,
281 u32 ssid, u32 tsid,
282 u16 tclass, struct av_decision *avd);
283
284int security_transition_sid(struct selinux_state *state,
285 u32 ssid, u32 tsid, u16 tclass,
286 const struct qstr *qstr, u32 *out_sid);
287
288int security_transition_sid_user(struct selinux_state *state,
289 u32 ssid, u32 tsid, u16 tclass,
290 const char *objname, u32 *out_sid);
291
292int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
293 u16 tclass, u32 *out_sid);
294
295int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
296 u16 tclass, u32 *out_sid);
297
298int security_sid_to_context(struct selinux_state *state, u32 sid,
299 char **scontext, u32 *scontext_len);
300
301int security_sid_to_context_force(struct selinux_state *state,
302 u32 sid, char **scontext, u32 *scontext_len);
303
304int security_sid_to_context_inval(struct selinux_state *state,
305 u32 sid, char **scontext, u32 *scontext_len);
306
307int security_context_to_sid(struct selinux_state *state,
308 const char *scontext, u32 scontext_len,
309 u32 *out_sid, gfp_t gfp);
310
311int security_context_str_to_sid(struct selinux_state *state,
312 const char *scontext, u32 *out_sid, gfp_t gfp);
313
314int security_context_to_sid_default(struct selinux_state *state,
315 const char *scontext, u32 scontext_len,
316 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
317
318int security_context_to_sid_force(struct selinux_state *state,
319 const char *scontext, u32 scontext_len,
320 u32 *sid);
321
322int security_get_user_sids(struct selinux_state *state,
323 u32 callsid, char *username,
324 u32 **sids, u32 *nel);
325
326int security_port_sid(struct selinux_state *state,
327 u8 protocol, u16 port, u32 *out_sid);
328
329int security_ib_pkey_sid(struct selinux_state *state,
330 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
331
332int security_ib_endport_sid(struct selinux_state *state,
333 const char *dev_name, u8 port_num, u32 *out_sid);
334
335int security_netif_sid(struct selinux_state *state,
336 char *name, u32 *if_sid);
337
338int security_node_sid(struct selinux_state *state,
339 u16 domain, void *addr, u32 addrlen,
340 u32 *out_sid);
341
342int security_validate_transition(struct selinux_state *state,
343 u32 oldsid, u32 newsid, u32 tasksid,
344 u16 tclass);
345
346int security_validate_transition_user(struct selinux_state *state,
347 u32 oldsid, u32 newsid, u32 tasksid,
348 u16 tclass);
349
350int security_bounded_transition(struct selinux_state *state,
351 u32 oldsid, u32 newsid);
352
353int security_sid_mls_copy(struct selinux_state *state,
354 u32 sid, u32 mls_sid, u32 *new_sid);
355
356int security_net_peersid_resolve(struct selinux_state *state,
357 u32 nlbl_sid, u32 nlbl_type,
358 u32 xfrm_sid,
359 u32 *peer_sid);
360
361int security_get_classes(struct selinux_state *state,
362 char ***classes, int *nclasses);
363int security_get_permissions(struct selinux_state *state,
364 char *class, char ***perms, int *nperms);
365int security_get_reject_unknown(struct selinux_state *state);
366int security_get_allow_unknown(struct selinux_state *state);
367
368#define SECURITY_FS_USE_XATTR 1 /* use xattr */
369#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
370#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
371#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
372#define SECURITY_FS_USE_NONE 5 /* no labeling support */
373#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
374#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
375#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
376
377int security_fs_use(struct selinux_state *state, struct super_block *sb);
378
379int security_genfs_sid(struct selinux_state *state,
380 const char *fstype, char *name, u16 sclass,
381 u32 *sid);
382
383#ifdef CONFIG_NETLABEL
384int security_netlbl_secattr_to_sid(struct selinux_state *state,
385 struct netlbl_lsm_secattr *secattr,
386 u32 *sid);
387
388int security_netlbl_sid_to_secattr(struct selinux_state *state,
389 u32 sid,
390 struct netlbl_lsm_secattr *secattr);
391#else
392static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
393 struct netlbl_lsm_secattr *secattr,
394 u32 *sid)
395{
396 return -EIDRM;
397}
398
399static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
400 u32 sid,
401 struct netlbl_lsm_secattr *secattr)
402{
403 return -ENOENT;
404}
405#endif /* CONFIG_NETLABEL */
406
407const char *security_get_initial_sid_context(u32 sid);
408
409/*
410 * status notifier using mmap interface
411 */
412extern struct page *selinux_kernel_status_page(struct selinux_state *state);
413
414#define SELINUX_KERNEL_STATUS_VERSION 1
415struct selinux_kernel_status {
416 u32 version; /* version number of thie structure */
417 u32 sequence; /* sequence number of seqlock logic */
418 u32 enforcing; /* current setting of enforcing mode */
419 u32 policyload; /* times of policy reloaded */
420 u32 deny_unknown; /* current setting of deny_unknown */
421 /*
422 * The version > 0 supports above members.
423 */
424} __packed;
425
426extern void selinux_status_update_setenforce(struct selinux_state *state,
427 int enforcing);
428extern void selinux_status_update_policyload(struct selinux_state *state,
429 int seqno);
430extern void selinux_complete_init(void);
431extern int selinux_disable(struct selinux_state *state);
432extern void exit_sel_fs(void);
433extern struct path selinux_null;
434extern struct vfsmount *selinuxfs_mount;
435extern void selnl_notify_setenforce(int val);
436extern void selnl_notify_policyload(u32 seqno);
437extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
438
439extern void avtab_cache_init(void);
440extern void ebitmap_cache_init(void);
441extern void hashtab_cache_init(void);
442extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
443
444#endif /* _SELINUX_SECURITY_H_ */